FT-920 Operating Manual
12
5. RF Field Exposure Advisory and
Electromagnetic Compatibility
This transceiver is capable of power output in ex-
cess of 50 Watts, so customers in the United States
may be required to demonstrate compliance with
Federal Communications Commission (FCC) regu-
lations concerning maximum permissible exposure
to radio frequency energy. Compliance is based on
the actual power output used, feedline loss, antenna
type and height, and other factors which can only be
evaluated as a system. Information regarding these
regulations may be available from your Dealer, your
local radio club, from the FCC directly (press releases
and other information can be found on the FCC’s site
on the World Wide Web at < http://www.fcc.gov >),
or from the American Radio Relay League, Inc. (225
Main St., Newington CT 06111 or < http://
www.arrl.org>).
Remember to re-evaluate your station’s compliance
with these regulations during portable operations such
as Field Day or special-event stations. Note, also,
that power output may be programmed to 50 Watts
(maximum) via Menu Items U-49 and U-50; see page
79 for details.
Regarding electromagnetic compatibility: if this trans-
ceiver is used with, or in the vicinity of, a computer or
computer-driven accessories, you may need to ex-
periment with grounding and/or Radio Frequency In-
terference (RFI) suppression devices (such as fer-
rite cores) to minimize interference to
your commu-
nications caused by energy from the computer. Com-
puter-generated RFI is usually a result of inadequate
shielding of the computer’s cabinet or I/O and pe-
ripheral connections. While computer equipment may
“comply” with RF emission standards, this does
not
ensure that sensitive amateur radio receivers will not
experience interference from the device!
Be certain to use only shielded cables for TNC-to-
Transceiver connections. You may need to install AC
line filters on the power cord(s) of the suspected
equipment, and decoupling ferrite toroidal chokes may
be required on interconnecting patch/data cables. As
a last resort, you can try installing additional shield-
ing within the computer’s case, using appropriate
conductive mesh or conductive shielding tape. Es-
pecially check “RF holes” where plastic is used for
cabinet front panels.
For further information, consult amateur radio refer-
ence guides and publications relating to RFI suppres-
sion techniques.
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Summary of Contents for FT-920
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